The Washington Gap Analysis Project created breeding bird maps only. The non-breeding birds (e.g., wintering, pelagic (coastal), and birds expanding their ranges) are represented only by NatureMapping sightings.
The Washington Gap Analysis Project could not find any historical research records (i.e., Breeding Bird Atlas, Breeding Bird Survey, Bird Banding and Recovery) for 73 species of birds. The Thayer's Gull is one of the species.
NatureMapping observations reported by townships throughout the year.
The Thayer's Gull winters on the coasts of western North America, from southern British Columbia to southern California and Baja California. In Washington, this gull is an uncommon to locally common winter resident of coastal waters. It is most abundant along the north Olympic Coast (Elwha River mouth, Ediz Hook) and the south Puget Sound; least common on the outer coast where it is outnumbered by the Herring Gull. It makes a rare appearance in winter on the Grand Coulee lakes and along the Columbia and Snake Rivers in eastern Washington.Text edited by Gussie Litwer